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| ENERGY EFFICIENCY EVALUATION MODEL IN DRILLING BASED ON FRACTAL FRAGMENTATION CHARACTERISTICS OF ROCK CUTTINGS |
| YAN Tie1，ZHANG Yang2，DU Shuming3 |
(1. College of Petroleum Engineering，Northeast Petroleum University，Daqing，Heilongjiang 163318，China；2. Oil and Gas Engineering Research Institute，PetroChina Tarim Oilfield Company，Korla，Xinjiang 841000，China；3. 50552 group，
International Drilling Company of West Drilling Engineering，Jiuquan，Gansu 735000，China) |
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Abstract According to the theory of fractal rock mechanics，energy efficiency evaluation model in drilling is established by analyzing fractal fragmentation characteristics on rock cuttings and drilling behavior characteristics，which contains crushing energy consumption model and energy efficiency model. The relationship between energy consumption and energy efficiency with fractal crushing characteristics of debris is studied. Results show that fractal dimension of particle-size distribution，maximum size and rock feature constant are dominant affecting factors for crushing energy consumption. And hydraulic decontamination coefficient and fractal dimension of particle-size distributionare are main affecting factors for energy efficiency. Energy efficiency is increasing with hydraulic decontamination and fractal dimension in exponential trend. Adjacent granularity similarity ration of rock cuttings has a little effect on energy efficiency.
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Received: 10 November 2012
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2014, Vol. 33 
